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The Bivalve Yangtzedonta is not the Brachiopod Xianfengella 总被引:2,自引:0,他引:2
YU Wen Nanjing Institute of Geology Palaeontology Chinese Academy of Sciences Nanjing Jiangsu China 《《地质学报》英文版》2005,79(6):770-776
Abstract The alleged "holotype"of the bivalve Yangtzedonta primitiva Yu.1985 figured by Qian (2001) is a broken and distorted specimen of the brachiopod Xianfengella prima He and Yang, 1982 and not the holotype of Y. primitiva. Qian contends that the oldest recognized monoplacophoran, Maikhanella pristinis (Jiang, 1980), is neither a monoplacophoran nor the oldest molluscan fossil in the Meishucunian Stage of China. Furthermore, he considers that the oldest bivalve Xianfengoconcha eUiptica Zhang, 1980 is an inarticulate brachiopod, not a mollusc. WatsoneUa yunnanensis (He and Yang, 1982), is associated with Yangtzedonta primitiva Yu but indicates no evolutionary relationship between the Classes Rostroconchia and Bivalvia in the Lower Cambrian Zhongyicun Member of the Yuhucun Formation. Qian's confusion in using non-molluscan fossils to discuss the early evolution of shelled molluscs also confuses the basic concepts of the respective groups. 相似文献
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